| abstract |
A process for recrystallization of a brominated aromatic compound under pressure for purifying it from the contamination by bromine and hydrogen bromide, comprising the steps of: placing the brominated aromatic compound in a solvent or a combination of solvents selected from toluene, 1,dibromoethane, m-xylene, benzene, dichloromethane, chloroform, and 1,2-dichloroethane; adding into the resultant mixture a base or a combination of bases selected from pyridine, ethylene diamine, n-butylamine, tert-butylamaine, triethylamine, sodium ethoxide, sodium hydroxide, potassium hydroxide, sodium carbonate, and sodium bicarbonate; and heating the resultant mixture to a temperature above the atmospheric boiling point and at a pressure above the vapor pressure of the resultant material at that temperature. |